The Metropolitan Museum of Art in New York City, which I have seen some of, has a really neat Timeline of Art History section.
http://www.metmuseum.org/toah/splash.htm?HomePageLink=toah_l
The world map option is pretty neat in itself:
http://www.metmuseum.org/toah/hm/10/hm10.htm
They even have a section for French Empire style items:
http://www.metmuseum.org/toah/hd/empr/hd_empr.htm
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